I realize the defending Eastern Conference champion Heat are much better than their 7-14 record. By the same token, though, the Wizards are better than their 5-13 record now that they finally are at full strength. 
Both teams have to deal with injuries and extensive COVID-19 issues. Miami, however, can not be laying this many points to an opponent who is better than perceived at this stage of their season right now.
The Heat are 1-7 in their last eight games. They just were outplayed by the Wizards in a 103-100 loss as 9-point home favorites this past Wednesday. Russell Westbrook didn't even play in that game. Westbrook was rested. He's back in action for this one teaming up with Bradley Beal, who torched Miami for 32 points two days ago. 
The Wizards are a far more respectable team with Davis Bertans, Deni Avdija and Rui Hachimura all back in the rotation.  
The Heat have several key players rounding into shape from injuries and sickness, including Jimmy Butler and Goran Dragic. 
Miami is 0-7-1 ATS the last eight times when favored.